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Optokinetic response (OKR) is a reflexive response which is elicited by a slowly moving image across the retina.The stimulation is generated by a drum with black-white vertical stripes on its internal wall horizontally rotating around the larvae.We treat 8-9 dpf larvae by either egg water or drugs for an hour before the experiments.The larvae are then transferred to a 3.5 cm-diameter petri dish containing 6% methylcellulose at the center of the drum.Images of the optokinetic responses are captured by CCD camera and processed by Image-J to analyze the effects of anxiolytic drugs on visual system.